BACKGROUND: Aflatoxin contamination in animal and poultry and its carry over to human beings is important in causing different diseases like Hepatitis and Liver Cirrhosis and finding methods to lessen toxin adsorption in animal and poultry tissues has a direct impact on health of animal products. OBJECTIVES: Evaluating the impact of natural toxin binder in broilers contaminated with aflatoxin B1 on performance, immunity and morpholgy of intestine. METHODS: 400 day-old broiler chicks under 4 treatments, 5 replicates and 20 chicks per replicate in completely randomized design manner were studied for 42 days. Experimental treatments were: 1- negative control (basal diet with out aflatoxin contamination); 2- positive control (basal diet + 0.6 mg/kg aflatoxin B1; 3- basal diet along with 1g/kg natural toxin binder and 4- basal diet + 1g/kg natural toxin binder. RESULTS: Presence of aflatoxin in diet reduced all performance indexes significantly (p

BACKGROUND: The application of medicinal herbs with high anti-oxidant properties could reduce the detrimental effects of oxidative stress and free radicals under heat stress and improve the performance of broilers. OBJECTIVES: The effects of rosemary powder and extract on growth performance, carcass characteristics and blood parameters of broilers were evaluated under heat stress. METHODS: For studying the effect of experimental treatments including control, different levels of rosemary powder (5, 10 and 15 g/kg), rosemary extract (3.5,7 and 10.5 g/kg) and Vit-Asp (1 g/L) on growth performance (feed intake, body weight and feed conversion ratio), carcass characteristics and blood parameters (cholesterol, triglyceride, hematocrit, glucose and heterophil to lymphocyte ratio), 160 one-day old chicks (Ross male-308) were used applying a randomized complete block design with 8 treatments, 4 replicates and 5 chicks per replicate during a 42-day period. Heat stress schedule was 32±2ºC as cyclic from 10.00 AM to 6.00 PM. RESULTS: Rosemary had significant effects on feed intake and final live weight of chicks (p<0.05) but not on feed conversion ratio (p>0.05). Significant effects from rosemary on glucose and heterophil to lymphocyte ratio were found (p<0.05). The effects of rosemary on carcass characteristics, cholesterol, triglyceride and hematocrit were not significant (p>0.05). CONCLUSIONS: In general, inclusion of rosemary in broilers diet under heat stress improved the performance because of anti-oxidant effects.Keyword: Rosemary, performance, blood parameters, heat stress, broilers